WebSocket handshake: Unexpected response code: 404 -

Question

I am learning about websockets and followed the instructions here: http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/HomeWebsocket/WebsocketHome.html

I\

Answer 1

The Error during the handshake happens, because Tomcat has its own api for websockets. Thus you might have added the JSR implementation or something similar as javax.websocket-api in your pom.xml there comes a conflict at runtime.

Try to not export your Websocket-library to your webserver, thus it uses its own implementation.

If you use maven, set the websocket dependency as provided:

<!-- Provided Websocket API, because tomcat has its own implementation -->
<dependency>
    <groupId>javax.websocket</groupId>
    <artifactId>javax.websocket-api</artifactId>
    <version>1.1</version>
    <scope>provided</scope>
</dependency>

Answer 2

I also had the same problem. Try removing the unwanted jars which contains websocket in your $JAVA_HOME/lib folder. and then add only what you are importing in serverendpoint file.